Polyamide fiber fabric

Abstract

The invention discloses a polyamide fiber fabric which is composed of 100% of polyamide fibers, the polyamide fibers are modified polyamide fibers A and common polyamide fibers B, and the depth difference delta L * between the modified polyamide fibers A and the common polyamide fibers B is larger than 5. And the color depth of the common polyamide fiber B in the polyamide fiber fabric is less than or equal to 1 / 1 standard depth specified in the GB / T4841.3-2006 standard. The polyamide fiber fabric not only has excellent color fastness and high tearing strength, but also has a heterochromatic effect, and can be widely used for producing down jackets, sunscreen clothes and the like.

Description

Technical Field

[0001] The present invention belongs to the field of textiles, and particularly relates to a polyamide fiber fabric. Background Art

[0002] Polyamide, commonly known as nylon, is favored by consumers due to its excellent properties such as softness, elastic recovery, abrasion resistance, and hygroscopicity. With the improvement of scientific and technological levels and living standards, people expect to obtain polyamide fabrics with different-color effects. However, the handfeel of the different-color fabrics obtained by mixing polyamide fibers with other fibers (such as polyester fibers) is not satisfactory. Therefore, researchers are committed to developing different-color fabrics made of 100% polyamide fibers.

[0003] For example, patent document CN111058146A discloses a woven fabric with a different-color effect and its uses, specifically discloses that the woven fabric is composed of cationic-dyeable nylon fibers and ordinary nylon fibers, and the different-color effect is obtained by dyeing ordinary nylon fibers with acid dyes and cationic-dyeable nylon fibers with cationic dyes. However, dyeing under acidic conditions easily causes ordinary nylon fibers to be stained by cationic dyes and results in poor color fastness. In addition, acid dyes carry negative charges and cationic dyes carry positive charges. When dyeing in the same bath, the combination of positive and negative ions easily generates precipitation, causing fabric defects such as color streaks and color spots. Summary of the Invention

[0004] The purpose of the present invention is to provide a polyamide fiber fabric with excellent color fastness, high tearing strength, and a different-color effect.

[0005] The technical solution of the present invention is as follows:

[0006] The polyamide fiber fabric of the present invention is composed of 100% polyamide fibers. The polyamide fibers are modified polyamide fiber A and ordinary polyamide fiber B. The depth difference ΔL* between the modified polyamide fiber A and the ordinary polyamide fiber B is greater than 5. The color depth of the ordinary polyamide fiber B in the polyamide fiber fabric is less than or equal to the 1 / 1 standard depth specified in the GB / T 4841.3-2006 standard.

[0007] The polyamide fiber fabric of the present invention utilizes the difference in the dyeing characteristics of the modified polyamide fiber A and the ordinary polyamide fiber B to obtain a 100% polyamide fiber fabric with a different-color effect. This fabric not only has a good different-color effect, excellent color fastness, but also high tearing strength, and can be widely used in the production of down jackets, sunscreen clothes, etc. Detailed Embodiments

[0008] The polyamide fiber fabric of the present invention is composed of 100% polyamide fibers, which are modified polyamide fiber A and ordinary polyamide fiber B. Here, the modified polyamide fiber A refers to a polyamide fiber with blocked terminal amino groups, and the ordinary polyamide fiber B refers to an unmodified conventional polyamide fiber. The fiber morphology of both the modified polyamide fiber A and the ordinary polyamide fiber B is filament, and the fabric structure of the polyamide fiber fabric is not particularly limited and can be a knitted fabric, a woven fabric, etc.

[0009] In the present invention, the depth difference ΔL* between the modified polyamide fiber A and the ordinary polyamide fiber B is greater than 5. Here, L* is an index for evaluating color depth. The depth of the modified polyamide fiber A is denoted as L* A , and the depth of the ordinary polyamide fiber B is denoted as L* B , and ΔL* is L* A and L* B The depth difference between them. The larger the ΔL* value, the better the heterochromatic effect. When ΔL* is greater than 5, the fabric has an excellent heterochromatic effect. When ΔL* is less than 5, the color difference is too small, and the heterochromatic effect of the fabric is difficult to be reflected.

[0010] In the present invention, the color depth of the ordinary polyamide fiber B in the polyamide fiber fabric is less than or equal to the 1 / 1 standard depth specified in the GB / T 4841.3 - 2006 standard. The fabric of the present invention is mainly medium - light color. When the color depth of the ordinary polyamide fiber B exceeds the 1 / 1 standard depth specified in the GB / T 4841.3 - 2006 standard, the depth difference between the modified polyamide fiber A and the ordinary polyamide fiber B becomes smaller, and the heterochromatic effect is not obvious.

[0011] Preferably, for the polyamide fiber fabric of the present invention, the blocking group of the terminal amino group of the modified polyamide fiber A contains a sulfonic acid group. The polyamide fiber fabric is dyed with acid dyes, which is achieved by the combination of the negatively charged sulfonic acid group contained in the acid dyes and the positively charged amino group at the end of the polyamide fiber. Some of the terminal amino groups of the modified polyamide fiber A are blocked by groups containing sulfonic acid groups and carry negative charges, which can effectively prevent the dyeing of acid dyes. At the same time, the terminal amino groups of the ordinary polyamide fiber B can combine with the sulfonic acid groups on the acid dyes, and the depth of the ordinary polyamide fiber B in the obtained fabric is greater than that of the modified polyamide fiber A, obtaining an excellent heterochromatic effect. On the other hand, considering that there is a small amount of sulfonic acid groups in the modified polyamide fiber A, the sulfonic acid groups will promote its hydrolysis and affect the tearing strength of the fabric. Therefore, it is considered to reduce the temperature of wet - heat processing (scouring temperature, dyeing temperature, etc.) in subsequent processing to effectively inhibit its hydrolysis and improve the tearing strength of the polyamide fiber fabric.

[0012] Preferably, for the polyamide fiber fabric of the present invention, the content of the terminal amino group of the modified polyamide fiber A is 0.3×10-5 ~1.0×10 -5 mol / g. This is considered because when the terminal amino group content is greater than 1.0×10 -5 mol / g, there are more terminal amino groups, and acid dyes are easily dyed. That is, the difference in ΔL* between the modified polyamide fiber A and the ordinary polyamide fiber B is small, and the color difference effect is not excellent enough. When the terminal amino group content of the modified polyamide fiber A is less than 0.3×10 -5 mol / g, that is, there are more sulfonic acid groups blocking the terminal amino groups. Considering that the sulfonic acid group is an electron-withdrawing group, it is easy to promote the hydrolysis of the modified polyamide fiber A. That is, the tear strength of the polyamide fiber fabric has a tendency to decrease. More preferably, the content of the terminal amino group of the modified polyamide fiber A is 0.3×10 -5 ~0.8×10 - 5 mol / g.

[0013] As a preference, for the polyamide fiber fabric of the present invention, the content of the terminal amino group of the ordinary polyamide fiber B is 4.0×10 -5 ~5.0×10 -5 mol / g. When the content of the terminal amino group is less than 4.0×10 -5 mol / g, that is, there are fewer terminal amino groups that can bind to the sulfonic acid group in the acid dye, and the dye uptake amount of the acid dye has a tendency to decrease, and the depth difference generated with the modified polyamide fiber A is small, and the color difference effect is not excellent enough. When the terminal amino group content of the ordinary polyamide fiber B is greater than 5.0×10 -5 mol / g, nitrogen oxides NOx in the air are likely to cause the oxidation of the amino group of the nylon fabric, resulting in yellowing of the polyamide fiber, and the color difference effect of the fabric is also easily affected.

[0014] For the polyamide fiber fabric of the present invention, its production method is not particularly limited and can be obtained by the following production method:

[0015] Select the modified polyamide fiber A and the ordinary polyamide fiber B for weaving (or knitting) to obtain a greige fabric, and then through scouring → intermediate setting → dyeing → resin finishing → drying and setting, the polyamide fiber fabric of the present invention is obtained.

[0016] Among them, for scouring, 1 - 2 g / L of scouring agent and 0.5 - 2 g / L of NaOH can be dissolved in soft water, and the scouring liquor is obtained by stirring evenly. The polyamide fiber greige fabric is put into the scouring liquor. Considering that a high temperature in wet heat processing will promote the hydrolysis of the modified polyamide fiber A, the temperature is preferably 80 - 90°C, and keep warm for 20 - 60 minutes.

[0017] For dyeing, 0.01 - 5% o.w.f acid dye, 1 - 5 g / L dyeing acid and 1 - 5 g / L leveling agent can be dissolved in soft water, stirred evenly to form a dyeing solution. Finally, the shaped polyamide fiber fabric is added to the dyeing solution and put into a dyeing machine. Considering that the high temperature of wet heat processing will promote the hydrolysis of modified polyamide fiber A, the temperature is preferably 80 - 90 °C and kept warm for 20 - 60 minutes. For color fixation, 1 - 5% o.w.f color fixing agent can be dissolved in soft water, stirred evenly to obtain a color fixing agent solution. The dyed polyamide fiber fabric is put into it, the temperature is 70 - 80 °C and kept warm for 10 - 30 minutes.

[0018] Only one kind of dye, acid dye, is used in the dyeing process, which solves the problem that ordinary polyamide fiber B is stained by other dyes. The obtained fabric has good washing, rubbing and perspiration color fastness. In addition, the acid dye has a complex molecular structure and has properties such as absorbing and scattering light energy, reducing the oxidation effect of ultraviolet rays on the fabric, avoiding the generation of free radicals in the polyamide fiber fabric, and making the fabric have excellent light color fastness.

[0019] The scouring agent, acid dye, leveling agent, dyeing acid and color fixing agent mentioned in the present invention are all commercially available products and can be selected according to needs.

[0020] The present invention will be described in detail below with reference to examples and comparative examples.

[0021] The test methods for the parameters involved in the present invention are as follows:

[0022] (1) Identification of fiber raw materials

[0023] The fiber type is determined according to FZ / T 01057.1 - 2007 "Test Methods for Identification of Textile Fibers".

[0024] (2) Determination of the content of terminal amino groups in polyamide fiber

[0025] After confirming that the fabric to be tested contains polyamide fiber according to the testing method (1) of this article, unwind the yarn from the fabric to be tested to obtain polyamide fiber for standby. Dissolve the polyamide fiber slices in trifluoroethanol and detect the terminal amino groups by potentiometric titration. Weigh (0.6500 ± 0.0500) g of the sample and put it into a 100 mL flask with a condenser. Add 40 mL - 50 mL of 88% trifluoroethanol reagent and heat and stir to dissolve for 30 min - 60 min on a magnetic stirrer. After dissolution, cool the conical flask in a beaker filled with water to room temperature (keep the flask connected to the condenser). Transfer the solution to a titration cup, turn on the automatic potentiometric titrator, and titrate with 0.02 mol / L HCl standard solution under stirring. Through the potential display, until an obvious inflection point is obtained, record the amount of the standard solution consumed V (mL). Calculate the terminal amino group content according to the following formula (1). Specifically refer to HG / T 4182 - 2012 "Nylon 66 Slices".

[0026] C NH2 =(V × C HCl × 1000) / m Formula (1)

[0027] In the formula:

[0028] C NH2 is the terminal amino group content, unit: milliequivalent per kilogram (mcq / kg);

[0029] C HCl is the concentration of the HCl standard solution, unit: mole per liter (mol / L);

[0030] m - the sample amount, unit: gram (g);

[0031] V - the amount of HCl consumed when an obvious inflection point is obtained, unit: milliliter (mL).

[0032] (3) Depth difference ΔL*

[0033] The color difference effect is evaluated by the depth difference ΔL* value. The larger the ΔL* value, the better the color difference effect.

[0034] First, confirm that the fabric to be tested contains modified polyamide fiber A and ordinary polyamide fiber B according to the content of the terminal amino groups in the testing method (2) of this article. Then unwind the yarn from the fabric to be tested to obtain about 2 g of modified polyamide fiber A and about 2 g of ordinary polyamide fiber B. Measure the L* value according to the JIS Z8722.5:2009 standard "Color Measurement Methods - Reflecting and Emitting Objects". Fibers A and B are each tested 4 times, and the average value is taken and recorded as L* A 、L* B 。

[0035] Finally, according to ΔL* = L* A-L* B The result is calculated.

[0036] (4) Determination of sulfonic acid groups in modified polyamide fiber A

[0037] According to the test method (2) in this article, the content of terminal amino groups is confirmed to determine the presence of modified polyamide fiber A. Then, the modified polyamide fiber A is cut into pieces, dried, mixed with dried potassium bromide, ground into powder and pressed into a film, and scanned using an infrared spectrometer. Since different chemical bonds or functional groups have different absorption frequencies, different absorption peaks will appear in the infrared spectrum, thereby determining whether sulfonic acid groups are contained in modified polyamide fiber A. The infrared spectrum shows absorption peaks at 1126 cm -1 and 623 cm -1 respectively corresponding to the stretching vibrations of the S=O bond and the S-O bond, indicating that sulfonic acid groups are contained in modified polyamide fiber A.

[0038] (5) Washing color fastness

[0039] According to the JIS L 0844:2011 standard.

[0040] (6) Rubbing color fastness

[0041] According to the JIS L 0849:2013 (Type II) standard.

[0042] (7) Perspiration color fastness

[0043] According to the JIS L 0848:2004 standard.

[0044] (8) Light color fastness

[0045] According to the ISO 105-B02:2014 standard.

[0046] (9) Tear strength

[0047] According to the JIS L 1096:2010 D method standard.

[0048] The present invention will be further described in detail below with reference to examples and comparative examples, but the implementation modes of the present invention are not limited thereto.

[0049] The reagents used in the following examples and comparative examples are as follows:

[0050] Scouring agent: The trade name is High-efficiency Scouring and Degreasing Agent RL-6S, Shanghai Mingsui Textile Chemical Industry Development Co., Ltd.

[0051] Acid dye: The trade name is Acid Dye Black GR, Shanghai Changxiang Color Technology Co., Ltd.

[0052] Cationic dye: Trademarked as Cationic Dye Black MG-ED(N), manufactured by Nippon Kayaku Co., Ltd.

[0053] Dyeing acid: Trademarked as Acid Release Agent SETACID PAS-1C, manufactured by Cima Chemical Industry (China) Co., Ltd.

[0054] Leveling agent: Trademarked as LAN Nylon Leveling Agent, manufactured by Jinjiang Debao Dye Technology Co., Ltd. Fixing agent: Trademarked as TA-SALT, manufactured by Nippon Kayaku Chemical (China) Co., Ltd.

[0055] Example 1

[0056] Select a polyamide fiber woven grey fabric composed of modified polyamide fiber A (specification: 20D-17f-FDY) and ordinary polyamide fiber B (specification: 20D-20f-FDY), with 50% content of fiber A and 50% content of fiber B. Both fiber A and fiber B are nylon 6, and the weave is plain. Among them, the terminal amino group of the modified polyamide fiber A is blocked by a group containing a sulfonic acid group, and the terminal amino group content is 0.5×10 -5 mol / g, and the terminal amino group content of the ordinary polyamide fiber B is 4.8×10 -5 mol / g. Then, the above grey fabric is subjected to finishing processing, including scouring (85°C × 20 min) → intermediate setting (170°C × 1 min) → dyeing (85°C × 30 min, Acid Black GR 3% o.w.f) → resin processing → drying and setting, to obtain the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0057] Example 2

[0058] The terminal amino group content of the modified polyamide fiber A is changed to 1.0×10 -5 mol / g, and the rest is the same as in Example 1, to obtain the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0059] Example 3

[0060] The terminal amino group content of the modified polyamide fiber A is changed to 0.8×10 -5 mol / g, and the rest is the same as in Example 1, to obtain the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0061] Example 4

[0062] The terminal amino group content of the modified polyamide fiber A is changed to 0.3×10 -5 mol / g, and the rest is the same as in Example 1, to obtain the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0063] Example 5

[0064] The terminal amino group content of the modified polyamide fiber A was changed to 0.2×10 -5 mol / g, and the rest was the same as in Example 1, obtaining the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0065] Example 6

[0066] The terminal amino group content of the modified polyamide fiber A was changed to 1.5×10 -5 mol / g, and the rest was the same as in Example 1, obtaining the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0067] Example 7

[0068] The terminal amino group content of the ordinary polyamide fiber B was changed to 4.0×10 -5 mol / g, and the rest was the same as in Example 1, obtaining the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0069] Example 8

[0070] The terminal amino group content of the ordinary polyamide fiber B was changed to 5.0×10 -5 mol / g, and the dosage of Acid Black GR during the dyeing process was changed to 1% o.w.f. The rest was the same as in Example 1, obtaining the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0071] Example 9

[0072] The terminal amino group of the modified polyamide fiber A was changed to be blocked by a nitrogen-containing group, and the structure of the nitrogen-containing group is shown in Formula 1 below. The rest was the same as in Example 1, obtaining the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0073]

[0074] Among them, R1 is a saturated or unsaturated aliphatic hydrocarbon group with 10 carbon atoms.

[0075] Example 10

[0076] The dosage of Acid Black GR during the dyeing process was changed to 4% o.w.f. The rest was the same as in Example 1, obtaining the polyamide fiber fabric of the present invention. The test results of each item are shown in Table 1.

[0077] Comparative Example 1

[0078] During the dyeing process, the dyes were changed to Acid Black GR and Cationic Black MG-ED(N). The two dyes were added to the dye liquor simultaneously. The dosage of Acid Black GR was 4% o.w.f, and the dosage of Cationic Black MG-ED(N) was 2% o.w.f. The rest was the same as in Example 1, obtaining a polyamide fiber fabric. The test results are shown in Table 1.

[0079] Table 1

[0080]

[0081] According to the above table,

[0082] (1) From Example 5 and Example 4, it can be seen that under the same conditions, the polyamide fiber fabric with the terminal amino group content of 0.2×10 -5 mol / g of modified polyamide fiber A and the polyamide fiber fabric with the terminal amino group content of 0.3×10 -5 mol / g of modified polyamide fiber A have comparable different-color effects and color fastness, but the tearing strength of the former is lower than that of the latter.

[0083] (2) From Example 6 and Example 2, it can be seen that under the same conditions, the polyamide fiber fabric with the terminal amino group content of 1.5×10 -5 mol / g of modified polyamide fiber A and the polyamide fiber fabric with the terminal amino group content of 1.0×10 -5 mol / g of modified polyamide fiber A have comparable tearing strength and color fastness, but the different-color effect of the former is lower than that of the latter.

[0084] (3) From Example 9 and Example 1, it can be seen that under the same conditions, the polyamide fiber fabric using nitrogen-group-blocked modified polyamide fiber A at the terminal amino group and the polyamide fiber fabric using sulfonic-group-blocked modified polyamide fiber A at the terminal amino group have comparable tearing strength and color fastness, but the different-color effect of the former is lower than that of the latter.

[0085] (4) From Comparative Example 1 and Example 10, it can be seen that under the same conditions, the polyamide fiber fabric dyed with two dyes, acid dye and cationic dye, with ΔL* of 4 and the polyamide fiber fabric dyed only with acid dye with ΔL* of 12 have comparable tearing strength, but the different-color effect and color fastness of the former are lower than those of the latter.

Claims

1. A polyamide fiber fabric, characterized in that: The polyamide fiber fabric is composed of 100% polyamide fibers, and the polyamide fibers are modified polyamide fiber A and ordinary polyamide fiber B. The depth difference ΔL* between the modified polyamide fiber A and the ordinary polyamide fiber B is greater than 5, and the color depth of the ordinary polyamide fiber B in the polyamide fiber fabric is less than or equal to the 1 / 1 standard depth specified in the GB / T 4841.3-2006 standard.

2. The polyamide fiber fabric according to claim 1, characterized in that: The blocking group of the terminal amino group of the modified polyamide fiber A contains a sulfonic acid group.

3. The polyamide fiber fabric according to claim 1 or 2, characterized in that: The content of the terminal amino group of the modified polyamide fiber A is 0.3×10 -5 ~1.0×10 -5 mol / g.

4. The polyamide fiber fabric according to claim 1, characterized in that: The content of the terminal amino group of the ordinary polyamide fiber B is 4.0×10 -5 ~5.0×10 -5 mol / g.

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